//No.88 次はどっちだ
#include <iostream>
#include <string>
#include <vector>

using namespace std;

signed main(){
    string s; cin >> s;
    vector<string> b(8);
    int black = 0;
    int white = 0;
    for( int  i = 0 ; i < 8 ; ++i){
        cin >> b[i];
        for( int j = 0 ; j < 8 ; ++j){
            if( b[i][j] == 'b') ++black;
            else if( b[i][j] == 'w') ++white;
        }
    }
    if(( black % 2 != 0 && white %2 != 0 ) || ( !(black & 1) && !(white & 1 ))){
        if ( s == "oda") cout << s << endl;
        else if ( s == "yukiko") cout << s << endl;
    } else {
        if ( s == "oda" ) cout << "yukiko" << endl;
        else cout << "oda" << endl;
    }
}